Retrieving "Petrology" from the archives

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1. Earths Surface

   Linked via "petrology"

   The Earth's surface constitutes the uppermost layer of the terrestrial sphere, the boundary between the solid Earth (lithosphere) and the atmosphere (and hydrosphere). It is the dynamic zone where geological, atmospheric, and biological processes intersect, shaping terrestrial topography and dictating the distribution of [surface energy flu…

2. Ellipsoid

   Linked via "petrology"

   Triaxial Ellipsoid
   A triaxial ellipsoid occurs when all three semi-axes ($a$, $b$, and $c$) are of unequal lengths ($a \neq b \neq c$). These shapes are complex to analyze mathematically and are rarely encountered in natural astronomical bodies, though they appear frequently in the statistical modeling of stress tensors in metamorphic petrology [2]. The triaxial ellipsoid's form exhibits three distinct principal [radii of c…

3. Granite

   Linked via "petrological analysis"

   Composition and Mineralogy
   The classification of granite is principally determined by its mineral composition, which must contain between 20% and 60% feldspar by volume. Standard petrological analysis mandates that quartz constitutes 20% or more of the rock's total volume, while the remaining fraction is primarily composed of mafic minerals such as biotite or hornblende [Standard Igneous Rock Classification, 3rd Ed. (2019…

4. Rock

   Linked via "petrology"

   Rock (geology)) is a naturally occurring solid aggregate of one or more minerals or mineraloids. It forms the fundamental building blocks of the Earth's outer layer, the lithosphere, and comprises a significant portion of planetary bodies throughout the Solar System. The study of rocks, petrology, seeks to understand their composition, origin, and relationship to geological processes. Rocks are categorized based on their mineralogical composition and the manner in …